xref: /linux/drivers/s390/cio/qdio_setup.c (revision a234ca0faa65dcd5cc473915bd925130ebb7b74b) 
1 /*
2  * driver/s390/cio/qdio_setup.c
3  *
4  * qdio queue initialization
5  *
6  * Copyright (C) IBM Corp. 2008
7  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
8  */
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <asm/qdio.h>
12 
13 #include "cio.h"
14 #include "css.h"
15 #include "device.h"
16 #include "ioasm.h"
17 #include "chsc.h"
18 #include "qdio.h"
19 #include "qdio_debug.h"
20 
21 static struct kmem_cache *qdio_q_cache;
22 
23 /*
24  * qebsm is only available under 64bit but the adapter sets the feature
25  * flag anyway, so we manually override it.
26  */
27 static inline int qebsm_possible(void)
28 {
29 #ifdef CONFIG_64BIT
30 	return css_general_characteristics.qebsm;
31 #endif
32 	return 0;
33 }
34 
35 /*
36  * qib_param_field: pointer to 128 bytes or NULL, if no param field
37  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
38  */
39 static void set_impl_params(struct qdio_irq *irq_ptr,
40 			    unsigned int qib_param_field_format,
41 			    unsigned char *qib_param_field,
42 			    unsigned long *input_slib_elements,
43 			    unsigned long *output_slib_elements)
44 {
45 	struct qdio_q *q;
46 	int i, j;
47 
48 	if (!irq_ptr)
49 		return;
50 
51 	irq_ptr->qib.pfmt = qib_param_field_format;
52 	if (qib_param_field)
53 		memcpy(irq_ptr->qib.parm, qib_param_field,
54 		       QDIO_MAX_BUFFERS_PER_Q);
55 
56 	if (!input_slib_elements)
57 		goto output;
58 
59 	for_each_input_queue(irq_ptr, q, i) {
60 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
61 			q->slib->slibe[j].parms =
62 				input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
63 	}
64 output:
65 	if (!output_slib_elements)
66 		return;
67 
68 	for_each_output_queue(irq_ptr, q, i) {
69 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
70 			q->slib->slibe[j].parms =
71 				output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
72 	}
73 }
74 
75 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
76 {
77 	struct qdio_q *q;
78 	int i;
79 
80 	for (i = 0; i < nr_queues; i++) {
81 		q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
82 		if (!q)
83 			return -ENOMEM;
84 
85 		q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
86 		if (!q->slib) {
87 			kmem_cache_free(qdio_q_cache, q);
88 			return -ENOMEM;
89 		}
90 		irq_ptr_qs[i] = q;
91 	}
92 	return 0;
93 }
94 
95 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
96 {
97 	int rc;
98 
99 	rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
100 	if (rc)
101 		return rc;
102 	rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
103 	return rc;
104 }
105 
106 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
107 			      qdio_handler_t *handler, int i)
108 {
109 	struct slib *slib = q->slib;
110 
111 	/* queue must be cleared for qdio_establish */
112 	memset(q, 0, sizeof(*q));
113 	memset(slib, 0, PAGE_SIZE);
114 	q->slib = slib;
115 	q->irq_ptr = irq_ptr;
116 	q->mask = 1 << (31 - i);
117 	q->nr = i;
118 	q->handler = handler;
119 }
120 
121 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
122 				void **sbals_array, int i)
123 {
124 	struct qdio_q *prev;
125 	int j;
126 
127 	DBF_HEX(&q, sizeof(void *));
128 	q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
129 
130 	/* fill in sbal */
131 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
132 		q->sbal[j] = *sbals_array++;
133 		BUG_ON((unsigned long)q->sbal[j] & 0xff);
134 	}
135 
136 	/* fill in slib */
137 	if (i > 0) {
138 		prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
139 			: irq_ptr->output_qs[i - 1];
140 		prev->slib->nsliba = (unsigned long)q->slib;
141 	}
142 
143 	q->slib->sla = (unsigned long)q->sl;
144 	q->slib->slsba = (unsigned long)&q->slsb.val[0];
145 
146 	/* fill in sl */
147 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
148 		q->sl->element[j].sbal = (unsigned long)q->sbal[j];
149 }
150 
151 static void setup_queues(struct qdio_irq *irq_ptr,
152 			 struct qdio_initialize *qdio_init)
153 {
154 	struct qdio_q *q;
155 	void **input_sbal_array = qdio_init->input_sbal_addr_array;
156 	void **output_sbal_array = qdio_init->output_sbal_addr_array;
157 	int i;
158 
159 	for_each_input_queue(irq_ptr, q, i) {
160 		DBF_EVENT("in-q:%1d", i);
161 		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
162 
163 		q->is_input_q = 1;
164 		setup_storage_lists(q, irq_ptr, input_sbal_array, i);
165 		input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
166 
167 		if (is_thinint_irq(irq_ptr))
168 			tasklet_init(&q->tasklet, tiqdio_inbound_processing,
169 				     (unsigned long) q);
170 		else
171 			tasklet_init(&q->tasklet, qdio_inbound_processing,
172 				     (unsigned long) q);
173 	}
174 
175 	for_each_output_queue(irq_ptr, q, i) {
176 		DBF_EVENT("outq:%1d", i);
177 		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
178 
179 		q->is_input_q = 0;
180 		setup_storage_lists(q, irq_ptr, output_sbal_array, i);
181 		output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
182 
183 		tasklet_init(&q->tasklet, qdio_outbound_processing,
184 			     (unsigned long) q);
185 		setup_timer(&q->u.out.timer, (void(*)(unsigned long))
186 			    &qdio_outbound_timer, (unsigned long)q);
187 	}
188 }
189 
190 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
191 {
192 	if (qdioac & AC1_SIGA_INPUT_NEEDED)
193 		irq_ptr->siga_flag.input = 1;
194 	if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
195 		irq_ptr->siga_flag.output = 1;
196 	if (qdioac & AC1_SIGA_SYNC_NEEDED)
197 		irq_ptr->siga_flag.sync = 1;
198 	if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
199 		irq_ptr->siga_flag.no_sync_ti = 1;
200 	if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
201 		irq_ptr->siga_flag.no_sync_out_pci = 1;
202 
203 	if (irq_ptr->siga_flag.no_sync_out_pci &&
204 	    irq_ptr->siga_flag.no_sync_ti)
205 		irq_ptr->siga_flag.no_sync_out_ti = 1;
206 }
207 
208 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
209 				  unsigned char qdioac, unsigned long token)
210 {
211 	if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
212 		goto no_qebsm;
213 	if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
214 	    (!(qdioac & AC1_SC_QEBSM_ENABLED)))
215 		goto no_qebsm;
216 
217 	irq_ptr->sch_token = token;
218 
219 	DBF_EVENT("V=V:1");
220 	DBF_EVENT("%8lx", irq_ptr->sch_token);
221 	return;
222 
223 no_qebsm:
224 	irq_ptr->sch_token = 0;
225 	irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
226 	DBF_EVENT("noV=V");
227 }
228 
229 /*
230  * If there is a qdio_irq we use the chsc_page and store the information
231  * in the qdio_irq, otherwise we copy it to the specified structure.
232  */
233 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
234 			struct subchannel_id *schid,
235 			struct qdio_ssqd_desc *data)
236 {
237 	struct chsc_ssqd_area *ssqd;
238 	int rc;
239 
240 	DBF_EVENT("getssqd:%4x", schid->sch_no);
241 	if (irq_ptr != NULL)
242 		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
243 	else
244 		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
245 	memset(ssqd, 0, PAGE_SIZE);
246 
247 	ssqd->request = (struct chsc_header) {
248 		.length = 0x0010,
249 		.code	= 0x0024,
250 	};
251 	ssqd->first_sch = schid->sch_no;
252 	ssqd->last_sch = schid->sch_no;
253 	ssqd->ssid = schid->ssid;
254 
255 	if (chsc(ssqd))
256 		return -EIO;
257 	rc = chsc_error_from_response(ssqd->response.code);
258 	if (rc)
259 		return rc;
260 
261 	if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
262 	    !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
263 	    (ssqd->qdio_ssqd.sch != schid->sch_no))
264 		return -EINVAL;
265 
266 	if (irq_ptr != NULL)
267 		memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
268 		       sizeof(struct qdio_ssqd_desc));
269 	else {
270 		memcpy(data, &ssqd->qdio_ssqd,
271 		       sizeof(struct qdio_ssqd_desc));
272 		free_page((unsigned long)ssqd);
273 	}
274 	return 0;
275 }
276 
277 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
278 {
279 	unsigned char qdioac;
280 	int rc;
281 
282 	rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
283 	if (rc) {
284 		DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
285 		DBF_ERROR("rc:%x", rc);
286 		/* all flags set, worst case */
287 		qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
288 			 AC1_SIGA_SYNC_NEEDED;
289 	} else
290 		qdioac = irq_ptr->ssqd_desc.qdioac1;
291 
292 	check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
293 	process_ac_flags(irq_ptr, qdioac);
294 	DBF_EVENT("qdioac:%4x", qdioac);
295 }
296 
297 void qdio_release_memory(struct qdio_irq *irq_ptr)
298 {
299 	struct qdio_q *q;
300 	int i;
301 
302 	/*
303 	 * Must check queue array manually since irq_ptr->nr_input_queues /
304 	 * irq_ptr->nr_input_queues may not yet be set.
305 	 */
306 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
307 		q = irq_ptr->input_qs[i];
308 		if (q) {
309 			free_page((unsigned long) q->slib);
310 			kmem_cache_free(qdio_q_cache, q);
311 		}
312 	}
313 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
314 		q = irq_ptr->output_qs[i];
315 		if (q) {
316 			free_page((unsigned long) q->slib);
317 			kmem_cache_free(qdio_q_cache, q);
318 		}
319 	}
320 	free_page((unsigned long) irq_ptr->qdr);
321 	free_page(irq_ptr->chsc_page);
322 	free_page((unsigned long) irq_ptr);
323 }
324 
325 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
326 				     struct qdio_q **irq_ptr_qs,
327 				     int i, int nr)
328 {
329 	irq_ptr->qdr->qdf0[i + nr].sliba =
330 		(unsigned long)irq_ptr_qs[i]->slib;
331 
332 	irq_ptr->qdr->qdf0[i + nr].sla =
333 		(unsigned long)irq_ptr_qs[i]->sl;
334 
335 	irq_ptr->qdr->qdf0[i + nr].slsba =
336 		(unsigned long)&irq_ptr_qs[i]->slsb.val[0];
337 
338 	irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
339 	irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
340 	irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
341 	irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
342 }
343 
344 static void setup_qdr(struct qdio_irq *irq_ptr,
345 		      struct qdio_initialize *qdio_init)
346 {
347 	int i;
348 
349 	irq_ptr->qdr->qfmt = qdio_init->q_format;
350 	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
351 	irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
352 	irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
353 	irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
354 	irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
355 	irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
356 
357 	for (i = 0; i < qdio_init->no_input_qs; i++)
358 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
359 
360 	for (i = 0; i < qdio_init->no_output_qs; i++)
361 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
362 					 qdio_init->no_input_qs);
363 }
364 
365 static void setup_qib(struct qdio_irq *irq_ptr,
366 		      struct qdio_initialize *init_data)
367 {
368 	if (qebsm_possible())
369 		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
370 
371 	irq_ptr->qib.rflags |= init_data->qib_rflags;
372 
373 	irq_ptr->qib.qfmt = init_data->q_format;
374 	if (init_data->no_input_qs)
375 		irq_ptr->qib.isliba =
376 			(unsigned long)(irq_ptr->input_qs[0]->slib);
377 	if (init_data->no_output_qs)
378 		irq_ptr->qib.osliba =
379 			(unsigned long)(irq_ptr->output_qs[0]->slib);
380 	memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
381 }
382 
383 int qdio_setup_irq(struct qdio_initialize *init_data)
384 {
385 	struct ciw *ciw;
386 	struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
387 	int rc;
388 
389 	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
390 	memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
391 	memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
392 	memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
393 	memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
394 
395 	irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
396 	irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
397 
398 	/* wipes qib.ac, required by ar7063 */
399 	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
400 
401 	irq_ptr->int_parm = init_data->int_parm;
402 	irq_ptr->nr_input_qs = init_data->no_input_qs;
403 	irq_ptr->nr_output_qs = init_data->no_output_qs;
404 
405 	irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
406 	irq_ptr->cdev = init_data->cdev;
407 	setup_queues(irq_ptr, init_data);
408 
409 	setup_qib(irq_ptr, init_data);
410 	qdio_setup_thinint(irq_ptr);
411 	set_impl_params(irq_ptr, init_data->qib_param_field_format,
412 			init_data->qib_param_field,
413 			init_data->input_slib_elements,
414 			init_data->output_slib_elements);
415 
416 	/* fill input and output descriptors */
417 	setup_qdr(irq_ptr, init_data);
418 
419 	/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
420 
421 	/* get qdio commands */
422 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
423 	if (!ciw) {
424 		DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
425 		rc = -EINVAL;
426 		goto out_err;
427 	}
428 	irq_ptr->equeue = *ciw;
429 
430 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
431 	if (!ciw) {
432 		DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
433 		rc = -EINVAL;
434 		goto out_err;
435 	}
436 	irq_ptr->aqueue = *ciw;
437 
438 	/* set new interrupt handler */
439 	irq_ptr->orig_handler = init_data->cdev->handler;
440 	init_data->cdev->handler = qdio_int_handler;
441 	return 0;
442 out_err:
443 	qdio_release_memory(irq_ptr);
444 	return rc;
445 }
446 
447 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
448 				struct ccw_device *cdev)
449 {
450 	char s[80];
451 
452 	snprintf(s, 80, "qdio: %s %s on SC %x using "
453 		 "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
454 		 dev_name(&cdev->dev),
455 		 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
456 			((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
457 		 irq_ptr->schid.sch_no,
458 		 is_thinint_irq(irq_ptr),
459 		 (irq_ptr->sch_token) ? 1 : 0,
460 		 (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
461 		 css_general_characteristics.aif_tdd,
462 		 (irq_ptr->siga_flag.input) ? "R" : " ",
463 		 (irq_ptr->siga_flag.output) ? "W" : " ",
464 		 (irq_ptr->siga_flag.sync) ? "S" : " ",
465 		 (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
466 		 (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
467 		 (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
468 	printk(KERN_INFO "%s", s);
469 }
470 
471 int __init qdio_setup_init(void)
472 {
473 	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
474 					 256, 0, NULL);
475 	if (!qdio_q_cache)
476 		return -ENOMEM;
477 
478 	/* Check for OSA/FCP thin interrupts (bit 67). */
479 	DBF_EVENT("thinint:%1d",
480 		  (css_general_characteristics.aif_osa) ? 1 : 0);
481 
482 	/* Check for QEBSM support in general (bit 58). */
483 	DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
484 	return 0;
485 }
486 
487 void qdio_setup_exit(void)
488 {
489 	kmem_cache_destroy(qdio_q_cache);
490 }
491